International Journal of Rotating Machinery

International Journal of Rotating Machinery / 2007 / Article

Research Article | Open Access

Volume 2007 |Article ID 83641 | 8 pages | https://doi.org/10.1155/2007/83641

Numerical Flow Simulation in a Centrifugal Pump at Design and Off-Design Conditions

Academic Editor: Jiun-Jih Miau
Received08 Jun 2006
Revised15 Jan 2007
Accepted10 Apr 2007
Published07 Jun 2007

Abstract

The current investigation is aimed to simulate the complex internal flow in a centrifugal pump impeller with six twisted blades by using a three-dimensional Navier-Stokes code with a standard k-ε two-equation turbulence model. Different flow rates were specified at inlet boundary to predict the characteristics of the pump. A detailed analysis of the results at design load, Qdesign, and off-design conditions, Q = 0.43 Qdesign and Q = 1.45 Qdesign, is presented. From the numerical simulation, it shows that the impeller passage flow at design point is quite smooth and follows the curvature of the blade. However, flow separation is observed at the leading edge due to nontangential inflow condition. The flow pattern changed significantly inside the volute as well, with double vortical flow structures formed at cutwater and slowly evolved into a single vortical structure at the volute diffuser. For the pressure distribution, the pressure increases gradually along streamwise direction in the impeller passages. When the centrifugal pump is operating under off-design flow rate condition, unsteady flow developed in the impeller passage and the volute casing.

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Copyright © 2007 K. W. Cheah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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